• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2003년도 추계 학술발표회논문집
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• pp.344-351
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• 2003

In order to consider the characteristics of nonlinear dynamic responses of seismic isolated bridges reasonably, piers and isolators are modeled as a 2-DOF bilinear system. Then nonlinear time-history earthquake response analysis is accomplished many artificial input ground motions which were generated to reflect the characteristics of earthquakes. Damage probabilities and failure probabilities of each structural elements of the brides are calculated by using Monte-Carlo simulation method. Based on LCC evaluation considering various cost items of direct/indirect damage costs, the optimal design method of seismic isolated bridges is proposed. By using a sensitivity analysis about the design variables and a cost effectiveness evaluation in the viewpoint of LCC, the validity and the adequacy of proposed optimal design method are verified.

• 한국항행학회논문지
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• 제16권6호
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• pp.1005-1013
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• 2012

본 논문에서는 $1/{\tau}$에 영향을 받는 간접 벡터 제어 방법으로 유도 전동기의 간접 벡터제어 방법을 모델링하였으며, 회전자 저항의 변화에 따른 자속 및 회전각을 추정하고 이것과 관계있는 속도 추정과 파라미터의 변하에 따른 것들을 Matlab/Simulink를 통하여 시뮬레이션하였다. 제안한 제어시스템의 고속 연산처리를 위하여 마이크로프로세서는 실시간 제어가 가능한 TMS320C31 DSP를 이용하였고, 속도제어 구동시스템의 성능을 알아보기 위해 컴퓨터 시뮬레이션을 통하여 그 타당성을 검토하였으며, 실험을 통해 컴퓨터 시뮬레이션 결과와 일치함을 보였다. 결과에서 보듯이 빠른 속도추정 특성과 부하변동에 대해서도 강인한 특성을 갖고 있음을 확인하였다. 이와 같은 상태를 시뮬레이션을 하였고 그 결과를 분석을 하여 좋은 시뮬레이션 결론을 얻을 수 있었다.

• 한국컴퓨터정보학회논문지
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• 제25권10호
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• pp.193-201
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• 2020

본 연구는 팀 기반 학습 모델을 인문사회계열 학생들의 수업에 적용하여 문제해결능력의 효과성을 평가하고 하위요인들 간의 관계에 대한 구조모형분석을 실시하는 것이다. 팀 기반 학습은 인문사회계열의 2학년과 3학년 각각 30명을 6개의 팀으로 구성하여 6차례 실시하였다. 대상학생들의 문제해결능력 점수는 팀 기반 학습 후의 문제해결능력 점수가 상당히 높게 나타났으며 통계적으로 유의미하게 나타났다. 문제해결능력 하위요인인 잠재변수들과의 정규성에 문제가 없었고, 잠재변수들에 대한 관측변수들의 확인적 요인분석에서 요인부하량 값이 .001수준에서 통계적으로 유의미하여 타당한 모형이었다. 연구모형의 적합도 검증에서도 좋은 수준의 적합도를 보여주었다. 결과적으로 원인분석, 문제명료화, 계획실행, 수행평가, 대안개발의 잠재변수들 간에는 서로 간접 또는 직접적으로 영향을 미치고 있는 것으로 분석되었다.

• 커뮤니케이션학 연구
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• 제18권1호
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• pp.165-193
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• 2010

본 연구는 단기 기억과 피험자 위주의 분석이 주를 이루는 기존 연구의 방향에 장기 기억과 BPL 단위의 분석을 추가하고 있다는 점에서 의의를 갖는다. 본 연구 결과, BPL은 단기재인(52.8%의 BPL), 장기재인(44.4%의 BPL), 장기회상(30.6%의 BPL)에서 효과적인 것으로 나타났다. BPL의 표현 방식에 따른 차이를 보면, 공감각적 BPL, 클로즈업된 BPL, 노출 시간이 긴 BPL, 주연 배우가 브랜드를 사용하는 BPL이 다른 경우의 BPL보다 효과적인 것으로 나타났다. 반면, 영화에 대한 선호도나 등장인물에 대한 선호도는 BPL 브랜드의 기억에 커다란 영향을 미치는 요소가 아니었다. 차후 연구자들은 더욱 정교한 실험 디자인을 개발하고, 매개 변인과 조절 변인의 효과를 탐구하여 현재 이 분야에 존재하는 혼란스러움을 해소해야 할 것이다.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2000년도 추계공동학술대회논문집
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• pp.265-283
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• 2000

Factors influencing the success or failure of information systems(IS) have been discussed in many literature. However, little theoretical development or empirical research has examined effectiveness of hospital information systems(HIS) This study set the research model of influencing factors and consequences of HIS through theoretical studies based on Management Information Systems, and then empirically tested several hypotheses related to this model. Based on a sample of 274 respondents who participated in dealing with the HIS, this research used a multiple regression analysis to test the research model. The results of this study are as follows: system quality, information quality and support of top management are statistically significant influence on user satisfaction. Service quality is a partially significant influence on user satisfaction. Hypothesis 5, proposing that computer self-efficacy would relate positively to user satisfaction, was not supported by the questionnaire results. Based on these results, system quality, information quality and support of top management are very important variables for IS success. And the study's findings indicate DeLone and McLean's model is correct in proposing that the indirect relationship between influencing factors and organizational effectiveness, mediated by user satisfaction, is an important one.

• The Journal of Asian Finance, Economics and Business
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• 제8권4호
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• pp.1033-1045
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• 2021

Corporate social responsibility for employees is associated with employees' requirements related to the work and the organization's ability to meet such needs. The study aims to examine the impact of corporate social responsibility for workers on employee management effectiveness amongst businesses in Vietnam. Using the quantitative method, through SEM linear structural model analysis, the research surveys 619 samples of employees at businesses in Vietnam. The study results show that corporate social responsibility for workers has both a direct and indirect impact on the effectiveness of employee management through intermediary factors such as organizational identity, organizational commitment, and knowledge sharing of employees. In addition, the study also demonstrates that commitment has a positive correlation with both organizational identification and knowledge sharing of employees in the businesses. On that basis, the study proposes several recommendations to improve employee administration efficiency. This study's findings have shown the importance and impact of corporate social responsibility in many respects on employee administration efficiency. These are meaningful contributions in theoretical and practical aspects that help businesses get a more in-depth insight into employee administration and the need to care and promote corporate social responsibility for employees, which is an important basis for further research.

• Asian Pacific Journal of Cancer Prevention
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• 제14권4호
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• pp.2533-2540
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• 2013

Background: Although screening is necessary where gastric cancer is particularly common in Asia, the performance outcomes of mass screening programs have remained unclear. This study was conducted to evaluate cost-effectiveness outcomes of the national cancer screening program (NCSP) for gastric cancer in South Korea. Materials and Methods: People aged 40 years or over during 2002-2003 (baseline) were the target population. Screening recipients and patients diagnosed with gastric cancers were identified using the NCSP and Korea Central Cancer Registry databases. Clinical outcomes were measured in terms of mortality and life-years saved (LYS) of gastric cancer patients during 7 years based on merged data from the Korean National Health Insurance Corporation and National Statistical Office. We considered direct, indirect, and productivity-loss costs associated with screening attendance. Incremental cost-effectiveness ratio (ICER) estimates were produced according to screening method, sex, and age group compared to non-screening. Results: The age-adjusted ICER for survival was 260,201,000-371,011,000 Korean Won (KW; 1USD=1,088 KW) for the upper-gastrointestinal (UGI) tract over non-screening. Endoscopy ICERs were lower (119,099,000-178,700,000 KW/survival) than UGI. To increase 1 life-year, additional costs of approximately 14,466,000-15,014,000 KW and 8,817,000-9,755,000 KW were required for UGI and endoscopy, respectively. Endoscopy was the most cost-effective strategy for males and females. With regard to sensitivity analyses varying based on the upper age limit, endoscopy NCSP was dominant for both males and females. For males, an upper limit of age 75 or 80 years could be considered. ICER estimates for LYS indicate that the gastric cancer screening program in Korea is cost-effective. Conclusion: Endoscopy should be recommended as a first-line method in Korea because it is beneficial among the Korean population.

• 보건행정학회지
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• 제26권3호
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• pp.155-171
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• 2016

Background: In this study, state-owned medical institutes, industrial accident hospitals, veteran hospitals, and private medical clinics including 16 university medical institutes in the Seoul metropolitan area were selected to examine the causality of ethical management, positive psychological capital, and organizational effectiveness. Methods: The study analyzed 1,056 valid questionnaires to which a total of 1,325 nurses, medical technicians, doctors, and administrative staff in 34 healthcare organizations answered over two months from June to August 2015. The study also utilized a 'structural equation model,' and a 'hierarchical linear model' to conduct the analysis. Results: It was first found that ethical leadership, ethical management systems, and organizational ethics values, which are the three factors of ethical management, had significant influence on organizational commitment, and behavior. These are the three factors of employee organizational effectiveness. Second, ethical management, ethical leadership, ethical management systems, and organizational ethics values had significant influence on positive psychological capital. Third, positive psychological capital had significant influence on organizational commitment, turnover intention, and organizational citizenship behavior. Positive psychological capital presented an indirect effect on the relationship between the ethical management and organizational effectiveness of employees. The effect of positive psychological capital consisting of self-efficacy, hope, resilience, and optimism was confirmed in the healthcare organizations. Fourth, in relations among ethical management variables, ethical leadership showed a significant impact on ethical management systems, which had significant impacts on organizational ethics values, which had significant impacts on ethical leadership.

• Journal of Preventive Medicine and Public Health
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• 제35권2호
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• pp.99-106
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• 2002

Objective : Until now, there have been no evidence-based guidelines produced for the mass screening of hyperlipidemia cases in Korea. This study was done to find the most efficient strategy for a hyperlipidemia-screening program among Korean adults, Method : Seven alternative strategies for hyperlipidemia screening were formulated and compared ir terms of cost-effectiveness. Cost and effectiveness were estimated from social perspectives and using a two-stage screening process (initial testing and additional testing for positives from the first test). A computerized database (based on persons who had visited a health promotion center in one teaching hospital for a routine health check-up) was used to determine the cost and the outcome of various strategies. Official data was used in calculating direct and indirect costs. Effectiveness was measured according to the number of persons who needed clinical intervention for hyperlipidemia. A stratified analysis, considering age group and sex, was then done. Sensitivity analyses, focusing on several uncertain parameters, were also done. Results : Of the seven test alternatives available, the most cost-effective strategy was a screening program, which consisted of an initial test of total cholesterol, high-density lipoprotein cholesterol and triglyceride. There was some variation in the rank of the cost-effectiveness ratios for the seven alternatives dependent on age group or gender. Conclusions : Current hyperlipidemia screening practice, for National Health Insurance beneficiaries, tests only the total cholesterol level with a cut-off value of 260mg/dl as an initial screening test. It is not the best strategy for cost-effectiveness, and should be modified. Different screening strategies taking age group and sex into account should be developed and used for the efficient mass screening of hyperlipidemia cases among Korean adults.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.285-288
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• 1996

Iron loss is a possible source of performance deterioration, especially for a torque regulation, in field oriented induction machine. In this paper, study on the model of an induction machine with iron losses, a flux estimation strategy, the design of direct and indirect field oriented controller, a precise torque regulation scheme and the determination of a core lost resistance are discussed. Simulation and experimental results are also included and show the effectiveness of the proposed analysis and the proposed control strategy.